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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a328b3728b9aba2c03a02b7797a70d781fb9c9cce827ed27bd7945e672c57441' 
  AND token = '73pBOqRrWrpF14lMaJeXd4qcuP7rNW6gOfKUlc5bSfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}